package com.sky.aspect;

import com.sky.annotation.AotuFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @version 1.0
 * @Author 郭腾高
 * @Date 2024/9/16 15:11
 * 自定义切面实现公共字段自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFileAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AotuFill)")
    public void autoFilePointCut(){}
    //前置通知，在通知中给公共属性赋值
    @Before("autoFilePointCut()")
    public void aotuFile(JoinPoint  joinPoint){
        //获取到当前拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AotuFill annotation = signature.getMethod().getAnnotation(AotuFill.class);//获得方法上的注解对象
        OperationType operationType = annotation.value();//获得数据库操作类型 注解上的枚举类型
        //获取到当前被拦截方法上的参数--实体对象
        Object[] args = joinPoint.getArgs();//获得所有参数
        //防止空指针异常
        if (args == null || args.length==0){
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据不同的操作类型，为对应的属性利用反射赋值
        if (operationType == OperationType.INSERT){
            //为4个公共字段来赋值
            try {
                Method setCreatTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为属性赋值
                setCreatTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if (operationType == OperationType.UPDATE){
            //为两个公共字段赋值
            try {

                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }
    }
}
